減る

1. Origins, structure, and basic meaning

• Structure: Spelling: 減る. Reading: へる. Core meaning: to decrease; to diminish.
• Basic usage: Representative examples: 雨の日が続くと、公園を訪れる人が減る / 水筒の水が半分まで減っていた.

2. Common pitfalls and similar expressions

• Intransitive and transitive change
  • Something decreasing is expressed with the intransitive 減る; causing a quantity to decrease uses 減らす. In this entry, the item that decreases is marked with が.